He could have been a doctor if he _ medicine.
Correct answer: B. Had studied
- A. Studied
- B. Had studied
- C. Studies
- D. Would study
Explanation
The correct answer is B: 'had studied.' The sentence structure 'could have been' indicates a past unreal condition, requiring the past perfect tense 'had studied' to convey the idea that the person had the potential to become a doctor if they had pursued medicine in the past. Options A, C, and D do not provide the correct past perfect form needed in the sentence.
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